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    <script>
        // 数组排序
        // 1. 翻转数组 reverse 数组名.reverse
        var arr = [1,2,3,4,5];
        arr.reverse();
        console.log(arr);
        // 2. 数组排序（冒泡排序） sort 数组名.sort
        var arr1 = [2,1,3,5,6,4]; 
        arr1.sort(function(a,b){
            return a - b; //升序的顺序排序
            // return b - a; //降序的顺序排序
        });
        console.log(arr1);
    </script>
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